EP2398733A1 - Device for grasping and active release of micro and nano objects - Google Patents
Device for grasping and active release of micro and nano objectsInfo
- Publication number
- EP2398733A1 EP2398733A1 EP09840193A EP09840193A EP2398733A1 EP 2398733 A1 EP2398733 A1 EP 2398733A1 EP 09840193 A EP09840193 A EP 09840193A EP 09840193 A EP09840193 A EP 09840193A EP 2398733 A1 EP2398733 A1 EP 2398733A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- objects
- gripping arms
- layer
- plunger
- release
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J7/00—Micromanipulators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J15/00—Gripping heads and other end effectors
- B25J15/08—Gripping heads and other end effectors having finger members
- B25J15/12—Gripping heads and other end effectors having finger members with flexible finger members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C99/00—Subject matter not provided for in other groups of this subclass
- B81C99/0005—Apparatus specially adapted for the manufacture or treatment of microstructural devices or systems, or methods for manufacturing the same
- B81C99/002—Apparatus for assembling MEMS, e.g. micromanipulators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C2203/00—Forming microstructural systems
- B81C2203/05—Aligning components to be assembled
- B81C2203/051—Active alignment, e.g. using internal or external actuators, magnets, sensors, marks or marks detectors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/902—Specified use of nanostructure
- Y10S977/962—Specified use of nanostructure for carrying or transporting
Definitions
- the present invention relates to micro and nano manipulation, micro and nanotechnologies, and automation at the micro and nano scales.
- Vacuum based method creates pressure differences between pick and place (W. Zesch, M. Bmnner, and A. Weber, "Vacuum tool for handling micro objects with a nano robot,” in Proc. IEEE Int. Conf. Robotics Automation, Albuquerque, NM, USA, Apr. 1997, pp. 1761-1766).
- This method is not suitable for use within a vacuum environment such as inside the SEM (scanning electron microscope), which limits its ability to manipulate sub -micrometer objects.
- Micro peltier coolers were used to form ice droplets instantaneously for picking up micro objects, and thawing the ice droplets to release objects (B. Lopez- Walle, M. Gauthier, and N. Chaillet, "Principle of a sub-merged freeze gripper for microassembly," IEEE Transactions on Robotics, vol. 24, pp. 897-902, 2008).
- the manipulation disclosed by Lopez- Walle et al must take place in an aqueous environment.
- United States Patent No. 6,987,277 discloses a method for pick and place of nano objects by selectively activating spots on a passivated substrate using a scanning probe microscope tip, then release the nano objects onto the activated spots using chemical and physical binding forces. This manipulation process requires specially treated sample and substrate.
- United States Patent No. 6,648,389 discloses a vibration-based release microgripper for pick and release.
- the fabrication process of the microgripper limits its scaling down capability, and the release accuracy is poor, as described in a similar, vibration-based design (Y. Fang and X. Tan, "A dynamic jkr model with application to vibration release in micromanipulation," in Proc. IEEE/RSJ Int. Conf. Intelligent Robots and Systems, Beijing, China, Oct. 2006, pp. 1341-1345).
- United States Patent No. 7,025,619 discloses the use of mechanical sockets for locking two micro components together for assembly. This method requires each component to have a specially designed mechanical junction for assembly.
- a device capable of grasping nanometer or micrometer sized objects and performing active release of the objects is provided.
- the present invention is a device for manipulating nanometer-scale sized objects or micrometer-scale sized objects, characterized in that the device comprises:
- microactuation means connected to the gripping arms and the release plunger and operable to actuate the gripping arms and said release plunger to grasp and actively release the objects from the gripping arms.
- the present invention is a method of manufacturing a device for manipulating nanometer-scale sized objects or micrometer-scale sized objects, said device comprising structural elements, said structural elements including gripping arms for grasping the objects, a release plunger for actively releasing the objects from gripping arms, and microactuation means connected to the gripping arms and the release plunger and operable to actuate the gripping arms and said release plunger to grasp and actively release the objects from the gripping arms, characterized in that said method comprises the following steps:
- the present invention is a method of manufacturing a device for manipulating nanometer-scale sized objects or micrometer-scale sized objects, said device comprising structural elements, said structural elements including gripping arms for grasping the objects, a release plunger for actively releasing the objects from gripping arms, and microactuation means connected to the gripping arms and the release plunger and operable to actuate the gripping arms and said release plunger to grasp and actively release the objects from the gripping arms, wherein the gripping arms comprise gripping tips having a thickness and wherein said method is capable of selectively reducing the thickness of said tips with respect to the structural elements, characterized in that the method comprises the following steps:
- the present invention is a method of manufacturing a device for manipulating nanometer-scale sized objects or micrometer-scale sized objects, said device comprising structural elements, said structural elements including gripping arms for grasping the objects, a release plunger for actively releasing the objects from gripping arms, and microactuation means connected to the gripping arms and the release plunger and operable to actuate the gripping arms and said release plunger to grasp and actively release the objects from the gripping arms, characterized in that said method comprises patterning etching a silicon-on-insulator wafer from a single side of said wafer.
- the present invention is a microfabrication method enabling the patterning of two layers of materials from a single side of a wafer in order to manufacture a device for manipulating nanometer-scale sized objects or micrometer-scale sized objects, said device comprising high-aspect-ratio structures and low-aspect-ratio structures, characterized in that said method comprises the following steps:
- the present invention is a method for grasping and placing an object to a desired target area with the use of a device capable of manipulating nanometer-scale sized objects or micrometer-scale sized objects, said device comprising gripping arms capable of opening and closing around the object, a release plunger for actively releasing the object from the gripping arms, and microactuation means connected to the gripping arms and the plunger and operable to actuate said gripping arms and release plunger, characterized in that said method comprises the following steps:
- integrated, single-chip, batch microfabricated MEMS devices are disclosed that are electrostatically or electrothermally driven grippers for grasping micrometer or nanometer sized objects with two independently actuated gripping arms and an integrated plunger for active release of the objects.
- the plunger is capable of impacting or pushing the objects and allows the adhered objects to gain sufficient momentum to overcome the adhesion forces and enables release on demand.
- Advantages of the present invention include a device for grasping and actively releasing objects having a design that permits (1) easy, secured grasping of micro or nanometer-sized objects; (2) rapid, highly reproducible, accurate release of the objects in target areas; and (3) precise down scaling of the microgripping tip for manipulating sub-micrometer and nanometer sized objects.
- Figure 1 illustrates a gripper with integrated active release plunger
- Figure 2 is a cross-sectional view of the gripper corresponding to Figure 1 along axis A-A;
- Figure 3 illustrates an example of pick-place sequence using an embodiment of the present invention
- Figure 4 shows the experimental landing result of lO ⁇ m microspheres with the use of active release plunger, proving an accuracy better than 18% of micro object size
- FIG. 5 illustrates fabrication process A
- Figure 6 illustrates a general fabrication process
- Figure 7 illustrates fabrication process B
- Figure 8 shows an SEM image of the microgripper with active release plunger fabricated using Process (A);
- Figure 9 shows an SEM image of the gripper tip fabricated using Process (B).
- the labelled dimensions illustrate the difference in thickness between the gripper tip vs. the rest of the structure;
- Figure 10 shows an alternative configuration of active release mechanism where bimorph microactuator is used.
- the present invention provides a device comprising an active release plunger capable of highly repeatable, accurate pick and place of micro and nanometer-sized objects.
- the present invention overcomes the drawbacks of existing designs (i.e., release and down scaling) and provides a micro-nanomanipulation tool that can grasp and release objects on demand, and can be readily down scaled through a new microfabrication process.
- the present invention is a device for manipulating nanometer-scale sized objects or micrometer-scale sized objects , characterized in that the device comprises:
- microactuation means connected to the gripping arms and the release plunger and operable to actuate the gripping arms and said release plunger to grasp and actively release the objects from the gripping arms.
- a novel microfabrication method is described, enabling the patterning of two layers of materials from a single side of a wafer.
- This microfabrication method can be integrated into most standard microfabrication processes that involve multi-layered wafers (e.g., silicon-on-insulator wafer) in order to construct devices with both high-aspect-ratio structures and thin end structures.
- the present invention is a method of manufacturing a device for manipulation of nano-scale sized objects comprising high-aspect-ratio structures and low-aspect-ratio structures, characterized in that said method comprises:
- the present invention is a method for grasping and placing an object to a desired target area with the use of a device capable of manipulating nanometer-scale sized objects and micrometer-scale sized objects, said device comprising gripping arms capable of opening and closing around the object, a release plunger for actively releasing the object from the gripping arms, and microactuation means connected to the gripping arms and the plunger and operable to actuate said gripping arms and release plunger, characterized in that said method comprises the following steps:
- Manipulation in the context of this invention means to perform displacement and assembly tasks on nano-scale or micro-scale objects, including, without limitation, grasping, lifting, pushing, releasing and injecting nano-scale or micro-scale objects.
- FIGS 1 and 2 illustrate one embodiment of the grasping and active releasing device of the present invention.
- the grasping and active releasing device comprises an electrostatically actuated microgipper comprising of three parts: (i) two electrostatic comb-drive microactuators B and C each controlling one of the two gripping arms Gl and G2 for grasping and gripper-plunger alignment; (ii) electrostatic comb-drive actuator D controlling active release plunger; and (iii) Linear beam flexures Fl, F2 and F3 used to transform actuated forces into displacements.
- the gripper and the plunger are actuated by lateral comb-drive microactuators.
- electrostatic actuators electrothermal actuators, or other types of microactuators in combination with motion/force amplification/reduction mechanisms are possible and within the scope of the present invention.
- Lateral comb-drive microactuators are ideal for micro-nanomanipulation due to its high bandwidth, high motion resolution, no temperature gradient, ease to implement, and adequate force output to overcome surface adhesion forces.
- the motion range and resolution of the actuators can be adjusted.
- Comb-drive microactuator B produces forces to deflect flexures Fl .
- the linear motion is directly transferred to the gripping arm Gl .
- the second gripping arm G2 connected to microactuator C through flexure F2 has a symmetrical configuration.
- the gripping arms are individually controlled by applying voltage between electrode E2 and El, or E4 and El.
- the gripping tip separation determines the suitable size of the object to be grasped.
- the active release plunger P is controlled by applying a voltage between electrode E3 and El, where the forces produced by the comb-drive microactuator deflect flexures F3 and produce linear motions.
- the four tethered flexures F3 minimize out-of-plane motion in the x-y plane, relative to the plunger tip.
- the active release plunger may be used in different ways.
- a sharp increase in the actuation voltage will allow the plunger P to move at a high speed and collide with the object adhered to one of the gripping arms Gl or G2.
- the impact allows the adhered object to gain sufficient momentum to overcome the adhesion forces between the object and a gripping arm, resulting in release.
- the plunger moves at a relatively low speed, the adhered object can be pushed off from the gripping arm and directly into the substrate; however, the success in release depends on adhesion force differences between the plunger-object and the object-substrate contact surfaces.
- a plunger When a plunger is extended beyond the gripping arm tip, it can also function as a needle probe for manipulation.
- Figure 3 illustrates an example of micromanipulation sequence of microspheres using a high speed plunger
- the microgripper approaches a microsphere and may use one gripping arm to laterally push it to break the initial adhesion bond between the microsphere and the substrate
- Two gripping arms are closed, grasping the microsphere and lifting it up.
- the microsphere is transported to the target area and positioned a minimum distance above the substrate,
- the gripping arms are opened and the gripping arm that the microsphere adheres to positions the microsphere properly to the right position in relation to the plunger,
- the plunger thrusts out the microsphere that lands accurately on the substrate,
- Microgripper retracts to repeat the pick-place process.
- the landing accuracy is inversely proportional to the height of the gripping arms and plunger above the substrate.
- the microgripper should be placed at a small distance above the destination. Using a high speed plunger, the micro object is separated from the plunger upon impact, hence the release capability is independent of the substrate.
- substrate herein refers to any surface for object to be released on, including on top of another object such as during the construction of three-dimensional structures.
- Figure 4 shows representative experimental accuracy results for active release of 1 O ⁇ m microspheres from 2 ⁇ m above the substrate.
- the release accuracy in this particular setup is 0.7 ⁇ 0.46 ⁇ m. Since the positioning system had a ⁇ l ⁇ m precision/repeatability and the environmental parameters were not strictly controlled, the release accuracy of the technique alone is expected to be better than a few hundreds of nanometers.
- This intuitive active release design is the f ⁇ rst-of-its-kind to allow a micro-nanometer-sized object to be picked up and released in both ambient and vacuum environments.
- the objects' size range from about 1 nm to about 500 ⁇ m.
- This new tool can find a range of applications. For example, physical modification and dissection a biology cell in electron microscopes for cytology research, and automated operation to construct three-dimensional novel micro-nano structures under optical and electron microscopes.
- Figure 5 shows microfabrication process (A) for devices capable of micromanipulating objects down to ⁇ l ⁇ m.
- Figure 7 shows a modified fabrication process (B) for devices capable of nanomanipulating sub-micrometer and nanometer-sized objects.
- Both processes use an SOI (silicon-on-insulator) wafer.
- SOI wafers for both microfabrication processes include SOI wafers having a 200-500 ⁇ m thick silicon handle layer, a 0.1 -2 ⁇ m thick of a buried insulating layer, such as a SiO 2 box layer, and a 10-300 ⁇ m thick silicon device layer.
- Steps for process (A) include:
- Handle layer 20 of the wafer 60 is etched using, for example, DRIE (deep reactive ion etching) until the buried oxide layer 40(photolithographic mask 1).
- DRIE deep reactive ion etching
- Ohmic contacts 30 are formed by e-beam evaporation and patterned by lift-off (photolithographic mask 2).
- Device layer 50 is patterned using photolithographic mask 3, and then etched using DRIE until the BOX (buried oxide) layer.
- SiO 2 BOX layer is etched and the individual devices 10 are released from wafer 60.
- the gripping tip ideally should have a comparable thickness to the object.
- microgrippers produced by process (A) can only be scaled down by reducing the thickness of the whole device, which induces problems such as undesired out-of-plane motion resulting from poor aspect ratio in flexures; reduced microactuator performance; and reduced device structural integrity.
- an SOI wafer has three layers - device silicon layer, buried oxide layer, and handle silicon layer
- no standard, existing niicrofabrication processes are able to form different patterns on each layer.
- the present invention describes a novel general fabrication process that enables the patterning of two layers of materials from a single side of a wafer, as shown in figure 6 and described below.
- this new process allows the buried oxide layer to be patterned differently from the device silicon layer and be patterned to form thin gripping tips for manipulating sub-micrometer and nanometer sized objects.
- This new process allows wafers with up to four different material layers to be patterned separately using conventional micromachining processes.
- a wafer with two material layers, layer A (top) and layer B (bottom), can both be patterned from a single side of the wafer through the following steps ( Figure 7):
- the working conditions for process (X) include:
- Suitable etching methods are available for etching materials A and B.
- Materials A and B have suitable etch selectivity, such as between Silicon and SiO2
- Photoresist can withstand etching of both material A and B.
- the new mi crofabri cation process (B) includes the following steps:
- Chromium is evaporated onto device layer 150, and patterned to define features such as comb fingers and flexures (photolithographic mask 1).
- Top SiO 2 layer is etched with RIE (reactive ion etching) using photolithographic mask 2 and predefined Cr etch mask.
- Ohmic contacts 130 are formed by e-beam evaporation and patterned by lift-off (mask 3).
- Bottom SiO 2 layer is patterned to form DRIE (deep reactive ion etching) etch mask on handle layer, (mask 4)
- Handle layer 120 is etched using DRIE until SiO 2 BOX layer.
- a thin film of a material having a predetermined electrical conductivity is evaporated onto the handle layer.
- Device layer 150 is patterned using photolithographic mask 5. Then the exposed silicon is etched using DRIE.
- Exposed metal/non-metal thin film is etched using RIE from the top.
- Exposed device layer silicon is etched using DRIE from the top.
- the general process illustrated in Figure 7 is integrated into process (B) as steps 1, 3, 8, 9, and 11, permitting the device silicon layer to be patterned into device structures (microactuators and flexures), and the BOX layer to be patterned into gripping tips.
- process (A) it is now possible to selectively reduce the gripping tip thickness to sub-micrometers for manipulating nanometre sized objects.
- step 2 in process (B) was added to minimize alignment issues with small features.
- process B allows the gripping tip to be made from a broad range of materials, conductive or non-conductive (determined by Process B, step 7).
- conductive or non-conductive determined by Process B, step 7.
- SEM scanning electron microscope
- the deposited thin film can also prevent charging effect and provide clearer images.
- the working environment for this type of grippers includes ambient and vacuum environments.
- Figure 8 shows an SEM image of an example gripper with a plunger for active release fabricated using Process (A). The device is suitable for micromanipulation of objects down to about 1 ⁇ m in size.
- Figure 9 shows an SEM image of an example gripper with a plunger for active release fabricated using Process (B). The device is suitable for nanomanipulation of objects smaller than about 1 ⁇ m in size.
- the present invention is the f ⁇ rst-of-its-kind in terms of active release repeatability and accuracy.
- the present invention is also the first-of-its-kind to allow precise thickness control over the microgripper tip without changing the thickness of device layer, through theintegration of a novel fabrication process (X) into fabrication process (A).
- An alternative configuration for active release is to replace the microactuator D in Figure 1 with an out-of-plane microactuator.
- the plunger can be replaced by a thermal bimorph microactuator, as shown in Figure 9.
- the top layer 310 comprises a deposited material with higher thermal expansion coefficient than the bottom layer. When heat is generated, the difference in thermal coefficients will drive the tip of the plunger in the direction indicated by the arrow (negative Z direction), releasing an adhered object through the out-of-plane motion from the plunger.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CA2009/000181 WO2010094102A1 (en) | 2009-02-17 | 2009-02-17 | Device for grasping and active release of micro and nano objects |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2398733A1 true EP2398733A1 (en) | 2011-12-28 |
EP2398733A4 EP2398733A4 (en) | 2016-12-21 |
Family
ID=42633377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09840193.8A Withdrawn EP2398733A4 (en) | 2009-02-17 | 2009-02-17 | Device for grasping and active release of micro and nano objects |
Country Status (5)
Country | Link |
---|---|
US (1) | US8979149B2 (en) |
EP (1) | EP2398733A4 (en) |
JP (1) | JP5489363B2 (en) |
CA (1) | CA2750918A1 (en) |
WO (1) | WO2010094102A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102179803A (en) * | 2011-03-31 | 2011-09-14 | 西北工业大学 | Large-displacement electrostatic drive micro-gripper based on arc-shaped comb teeth |
US8746310B2 (en) | 2011-05-31 | 2014-06-10 | The United States of America, as represented by the Secretary of Commerce, The National Instutute of Standards and Technology | System and method for probe-based high precision spatial orientation control and assembly of parts for microassembly using computer vision |
WO2015069709A1 (en) * | 2013-11-06 | 2015-05-14 | Abb Technology Ag | Method and apparatus for using vibration to release parts held by a robotic gripper |
KR101681231B1 (en) * | 2015-05-13 | 2016-12-02 | 서강대학교산학협력단 | Method of manufacturing micro-cantilever having functionlity probe |
US9708135B2 (en) * | 2015-10-02 | 2017-07-18 | University Of Macau | Compliant gripper with integrated position and grasping/interaction force sensing for microassembly |
IT201600132144A1 (en) | 2016-12-29 | 2018-06-29 | St Microelectronics Srl | MICRO-ELECTRO-MECHANICAL ACTUATOR DEVICE WITH PIEZOELECTRIC CONTROL, MOBILE IN THE PLAN |
IT201800002364A1 (en) * | 2018-02-02 | 2019-08-02 | St Microelectronics Srl | MICRO-ELECTRO-MECHANICAL MICRO-MANIPULATOR DEVICE WITH PIEZOELECTRIC CONTROL, MOBILE IN THE HOB |
FR3102946B1 (en) * | 2019-11-13 | 2022-04-01 | Percipio Robotics | Device for microactuator and microactuator equipped with such a device |
US11102596B2 (en) | 2019-11-19 | 2021-08-24 | Roku, Inc. | In-sync digital waveform comparison to determine pass/fail results of a device under test (DUT) |
CN111547280B (en) * | 2020-05-20 | 2021-12-24 | 上海航天控制技术研究所 | Low-power-consumption high-integration high-reliability space adhesion device |
CN114102555A (en) * | 2021-11-30 | 2022-03-01 | 中国运载火箭技术研究院 | Bionic micro robot based on stress deformation of composite film |
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US5046773A (en) * | 1990-01-02 | 1991-09-10 | Hewlett-Packard Company | Micro-gripper assembly |
JPH0596439A (en) * | 1991-10-05 | 1993-04-20 | San Le-Tsu Kk | Clamping device for workpiece |
JPH0985665A (en) | 1995-09-19 | 1997-03-31 | Hitachi Metals Ltd | Hand for minute part |
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JP2000323830A (en) | 1999-05-12 | 2000-11-24 | Hitachi Ltd | Apparatus for mounting components |
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-
2009
- 2009-02-17 US US13/201,841 patent/US8979149B2/en active Active
- 2009-02-17 EP EP09840193.8A patent/EP2398733A4/en not_active Withdrawn
- 2009-02-17 CA CA2750918A patent/CA2750918A1/en not_active Abandoned
- 2009-02-17 JP JP2011549401A patent/JP5489363B2/en active Active
- 2009-02-17 WO PCT/CA2009/000181 patent/WO2010094102A1/en active Application Filing
Non-Patent Citations (1)
Title |
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Also Published As
Publication number | Publication date |
---|---|
EP2398733A4 (en) | 2016-12-21 |
US8979149B2 (en) | 2015-03-17 |
JP5489363B2 (en) | 2014-05-14 |
CA2750918A1 (en) | 2010-08-26 |
JP2012517903A (en) | 2012-08-09 |
WO2010094102A1 (en) | 2010-08-26 |
US20110299969A1 (en) | 2011-12-08 |
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